Daughter of a Myth

Willow is not a ordinary teenager you would meet. She lives in a orphanage until she is adopted. When she is adopted she meets a boy named Percy. They are attacked by something not human and then she is taken to a camp by Percy. When she is there she finds out that she is a demigod. She is given a quest to go on. When she goes on the quest she is accompanied by Percy and her new friend kat. They go into a big battle and many of the enemies die but one of them dies as well. They retire back to the camp to deliver the news. Then something big happens that has everyone confused and one surprised. There two love lives that make the other sad.
This books goes of the camp idea and used some of the campers from the Percy Jackson books.